# Circular 7894

A 2 cm thick layer of ice formed in the circular water tank. What part of the tank's water (answer in percent) froze if the tank has a diameter of 20 m and a depth of 1.5 m?

### Correct answer:

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#### You need to know the following knowledge to solve this word math problem:

**arithmetic**- comparing
**solid geometry**- cylinder
**planimetrics**- circle
- area of a shape
**basic functions**- percentages
**numbers**- fractions

#### Units of physical quantities:

#### Grade of the word problem:

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